Introduction to Mechanical Design

Recommended Prerequisites

Materials Science, Strength of Materials, Applied Mechanics.

Teaching Methods

Theoretical classes present and develop topics that correspond to the syllabus of the course. Theoretical-practical classes develop applications of the concepts taught in theoretical classes to concrete problems, seeking that the student has an active participation suggesting strategies for solving the proposed problems. Students should also make a small project of equipment mainly focused on dimensioning and will be carried out partly in class and mostly overtime. 

Learning Outcomes

It is intended to give the student a vast and integrating knowledge of mechanical component calculation in medium complexity projects, addressing static design and fatigue. Calculation methods for connecting elements and mechanical transmission are presented. At the end of the course, the student should be able to design mechanical elements, namely welded joints, bolted connections, shafts and keys. It should also develop capacity for careful selection of rolling bearings and shaft joints.

Work Placement(s)

No

Syllabus

Introduction: Design Methodologies, Dimensioning for strength, Stress concentration, Dimensioning for rigidity, Yield criteria, Fracture toughness. Fatigue: Testing, S-N curves, Low cycle fatigue, Fatigue parameters, Safe fatigue stress for constant load amplitude, Biaxial fatigue design under bending and torsion in ductile materials, Miner's law. Shafts and couplings: Shaft design for static and fatigue loads, Design for deformation, Critical speed, Keys, Shaft couplings.  Rolling bearings: Types, Life and load capacity, Selection of rigid ball and angular contact bearings based on nominal life. Screws: Motion screws, Screws with pre-tension, Fatigue of screws, Eccentric loaded screws. Welded joints: Types of joints, Static calculation of welded joints, Off-planar loads, Fatigue design of welded structures, Improving fatigue strength.

Head Lecturer(s)

Diogo Mariano Simoes Neto

Assessment Methods

Assessment
Project: 25.0%
Exam: 75.0%

Bibliography

C.M. Branco, J.A.M. Ferreira, J.D.M. Costa e A. Ribeiro “Projecto de Orgãos de Máquinas”, Ed. Fundação C. Gulbenkian, 3ª ed, 2008.

R. C. Juvinall, K. M. Marshek, “Fundamentals of Machine Component Design”, 5ª Edição,  John Wiley & Sons, 2012.

- J.E. Shigley, C.R. Mischke, R.G. Budynas, Projeto de engenharia mecânica, 7ª ed. - Porto Alegre: Bookman, 2005.

R. L. Norton, “Machine Design – an Integrated Approach”, 3ªEdiçao, Prentice Hall Inc., 2006.

K. S. Eduards, Jr. and R. B. McKee, “Fundamentals of Mechanical Component Design”, Ed. McGraw-Hill Int., 1991.